Susan travels by car at an average speed of 50 miles per hour for 4 hours and then at an average speed of 20 miles per hour for 2 hours. What is her average speed, in miles per hour, for the entire 6-hour trip?
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average speed =total distance travelled ÷ total time
=70 miles ÷6hours
= 11.66 miles per hr.
H.P.
=70 miles ÷6hours
= 11.66 miles per hr.
H.P.
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